Steam-valve



(No Model.)

- D '.-H. THORPE,

STEAM VALVE-.1

I No. 292,185- 7 Patented'Jan. 22,1 84,

N runs. Mum war-um m:

UNITED STATES P TENT OFFICE. 1

DAVID H. THORPE, or. SOMERVILLE, ASSIGNOR- To HIMSELF, AND JOHN P.

HOWARD, or BOSTON, MASsAoHUSETTS.

STEAM-VALVE.

SPECIFICATION forming part of Letters Patent No. 292,185, dated January 22, 1884.

' Application filed June 21, 1883. (No model.)

To whom it may concern Be it known that I, DAVID H. THORPE, of Somerville, in the county of Middlesex, State of Massachusetts, have invented a certain new and useful Improvement in Steam-Valves, of which the following is a description sufficiently full, clear, and exact to enable any person skilled in the art or science to which said invention appertains to make and use the same, reference being had to the accompanying drawings, forming a part of this specification, in which Figure 1 is a view, partly in vertical 1ongitudinal section, showing the improvement as applied to a gate-valve; Fig. 2, a transverse section of the neck of the valve-case and cone, and Fig. 3 a sectional view of the cone and a portion of the stem.

Like letters of referen ce indicate corresp onding parts in the'different' figures of the drawlngs.

My invention relates more especially to means forpacking the stems in that class of steamvalves which are provided with rotating stems,

or stems which turn without moving longitudinally in opening or closing them; and it consists in a novel construction and arrangement of the parts, as hereinafter more fully set forth and claimed, by which a more effective device of this character is produced than is now in ordinary use. p

The nature and operation of the improvement will be readily understood by all conversant with such matters from the following explanation, its extreme simplicity rendering an elaborate description unnecessary.

In the drawings, A represents the stem; 13, the neck of the valve-case; D, the spring; 0, the nut for adjusting the tension of the latter, and E the valve. The neck of the valve-case is provided at its lower end with a valve-seat, :19, adapted to receive the valve E, and with a screw-thread, m, for attaching it to the body of the valve. The upper end, f, of the stem A is provided above the neck, of the valve ease with a short screw-thread, g, and is slightly smaller in diameter above said thread than below it.

A screw, G, extends downwardly from the stem, said screw being designed to open and shut a gate, which itis not deemed essential to show.

In the use of my improvement,the wheel H being removed, the neck of the valve-case B is slipped on over the top of the stem A, its seat w resting on the cone E. The spring D is then placed on top of the neck of the valvecase and the nut 0 passed over the top of the stem and screwed down, drawing the cone E upwardly into its seat :0 until the stem is properly packed or a tight joint is formed, after which the wheel is secured in position on the stem, as shown. The nut 0 enables the pressure on the cone to be varied as desired, and, being always readily accessible, affords a more convenient means, in connection with the cone and spring, of packing the stem than has to my knowledge been heretofore employed.

It will be obvious that my improvement is well adapted to packing the valve-stems of stop-cocks, and that it may be used in connection with either steam or water fixtures, and without reference to the kind of valve to be operated by the stem.

Having thus explained my invention, what I claim is y The combination, in a valve, of a neck, B, provided. with a valve-seat, m, and screwthread, m, a stem, A, passing through said neck and provided at its lower end with a valve, E, and above said neck with a short screw-thread, g, the said stem being smaller in diameter above than below said short screwthread, an adjusting-nut adapted to fit said short sorew-thread, and a spring interposed between said nut and the top of said neck, substantially as described.

DAvID H. THORPE. 

